Audials has some cool features and it's reasonably easy to use. Here's a quick screencast of the interface. You can choose Internet radio or podcasts, and they categorize a number of podcasts for quick browsing.
You can search for particular podcasts, and you can save podcasts to your favorites by clicking the star.
Here's where it gets interesting for language teachers. If you scroll down past the categories, you will see a link to "Show All Languages"
Select your language, and you have the same categories for that language.
So, that's pretty cool! Lots of options for students and teachers using Chromebooks.